P1144moderate severityPowertrain
HO2S High Variance Bank 1 Sensor 2
on 2022 Buick Encore 1.4L Turbo I4 · AWD
What this code means
The downstream oxygen sensor on bank 1 is showing excessive voltage swings beyond expected range. This is a GM-specific code with no direct generic OBD-II equivalent.
Symptoms
- Check engine light on
- Erratic fuel trim readings
- Reduced fuel economy
Common causes
- Faulty downstream O2 sensor
- Exhaust leak near sensor
- Wiring short or noise
- Poor sensor ground
Diagnostic steps
- Scan and record freeze frame data
- Monitor rear O2 sensor voltage live
- Check for exhaust leaks
- Inspect wiring and replace sensor if needed
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Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0005
Fuel Shutoff Valve A Control Circuit/Open
P0006
Fuel Shutoff Valve A Control Circuit Low
P0007
Fuel Shutoff Valve A Control Circuit High
P0008
Engine Position System Performance - Bank 1
P0009
Engine Position System Performance - Bank 2
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1